Monachaster

{{Short description|Genus of starfishes}}

{{Speciesbox

| image = Monachaster sanderi.jpg

| image_caption =

| genus = Monachaster

| parent_authority = Döderlein, 1916 {{ cite web |url=http://www.marinespecies.org/asteroidea/aphia.php?p=taxdetails&id=205503 |author=C. L. Mah |title=Asteroidea taxon details for Monachaster Döderlein, 1916 |year=2010 |work=World Asteroidea Database |accessdate=June 29, 2011}}

| species = sanderi

| authority = (Meissner, 1892)

}}

Monachaster sanderi is a species of sea stars in the family Oreasteridae. It is the sole species in the genus Monachaster.